Sanyo LA8670M Specifications

Monolithic Linear IC

Ordering number : EN4930

52095TH (OT) No. 4930-1/10

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Double-Conversion Narrow-Band

FM IF System

LA8670M

Overview

The LA8670M is a narrow band FM IF system for use in
communication equipment. In addition to the functions
required for FM reception, the LA8670M provides a rich
set of additional functions including noise detection and
field strength detection, and is thus optimal for cordless
telephones.

Functions

• First mixer, first local oscillator, first local oscillator
buffer output, second mixer, second local oscillator

• IF amplifier, limiter, quadrature detector

• Signal meter

• Noise detector, noise amplifier, noise wave detector,
Schmitt trigger

Features

• Low voltage operation: V

CC OP

= 1.8 to 6 V

• Signal meter linear over a wide range (70 dB typical)

• High sensitivity, high intercept point

Package Dimensions

unit: mm

3112-MFP24S

Specifications

Maximum Ratings at Ta = 25°C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 7.0 V
Allowable power dissipation Pd max Ta ≤ 75°C 150 mW
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +125 °C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

3.0 V

Operating supply voltage V

CC OP

1.8 to 6.0 V

[LA8670M]

SANYO:MFP24S

Operating Characteristics at Ta = 25°C, VCC= 3 V, fC(MIX) = 49.830 MHz, fmod = 1 kHz, ∆f = ±3 kHz

Note: AC levels are all indicated for open (EMF) circuits.

No. 4930-2/10

LA8670M

Parameter Symbol Conditions min typ max Unit

Quiescent current I

CCO

No input 7.3 9.5 mA
Mixer intercept point Ip3 First mixer –4.8 dBm
12 dB sensitivity 12dB S/N No input matching 3.2 5.0 dBµ
Demodulator output V

O

Vin = 80 dBµ 143 180 227 mVrms
Signal-to-noise ratio S/N No modulation, Vin = 80 dBµ 60 67 dB
AM rejection ratio AMR AM 30% modulation 35 43 dB
Total harmonic distortion THD Vin = 80 dBµ 2.2 3.0 %

V

SM (1)

Vin = 0 dBµ 0.05 0.30 0.65 V
Signal meter output V

SM (2)

Vin = 40 dBµ 0.60 0.90 1.40 V

V

SM (3)

Vin = 80 dBµ 1.05 1.40 1.85 V

Noise detector output

V

ND (1)

fi = 40 kHz, Vi = –50 dBV 0.10 0.25 V

V

ND (2)

fi = 40 kHz, Vi = –30 dBV 1.10 1.40 1.70 V

Noise detector level

V

14 (1)

Schmitt on 0.53 0.63 0.73 V

V

14 (2)

Schmitt off 0.33 0.43 0.53 V

Schmitt output level

V

SH (1)V14

= 0.8 V 0.3 V

V

SH (2)V14

= 0.2 V 2.8 V

Mixer conversion gain

G

M1

First mixer 19 dB

G

M2

Second mixer 24 dB
Mixer input frequency 90 MHz

Mixer input resistance

First mixer 5 kΩ

Second mixer 330 Ω

Mixer output resistance

First mixer 330 Ω

Second mixer 2.0 kΩ
FM detector output impedance 520 Ω

Equivalent Circuit Block Diagram

No. 4930-3/10

LA8670M